PREFACE ny. 
Laboratory of Natural History; Dr. C. Hart 
Merriam, Chief of Biological Survey, United 
States Department of Agriculture. 
On Migration: Mr. William Brewster, Presi- 
dent American Ornithologists Union ; Mr. Frank 
M. Chapman, of American Museum of Natural 
History, of New York. 
On Sleep: Rev. Leander Keyser; Mr. J. 
~Newton Basket. 
On Language: Mr. John Burroughs; Profes- 
sor Hameric, of Peabody Conservatory of Music 
of Baltimore ; Mr. Leverett M. Loomis, of Cali- 
fornia Academy of Sciences. 
OLIVE THORNE MILLER. 
